The modern 17 inch (LTM170EU-12LCD) liquid crystal display, fault phenomenon is the boot screen show black screen. The color of the image appears red and gray, and the bad or the tube aging of the high voltage inverter is judged.. Switching power supply and four lamp high voltage inverter circuit in the block circuit board, there are 5V and 12V two output.
1 open the display
First unplug the four tubes to the high-voltage inverter in connection to the logic board, motherboard, keyboard cable. Then remove the 4 screws on both sides of the screen frame, remove the switch power and the motherboard fixed frame. The screen face down on the mattress (Ru Haimian). The screen frame from the front metal frame, injection parts box, metal back cover three parts. Logic circuit board door 3 single small screws will be removed, and word small knife pry the front frame around 11 buttons (3 4% each 2). Before taking the screen metal box. LCD screen or face down on the cushion, from around to pry open the plastic box and cover all card buckle, desirable under cover, plastic box and reflectors, reflective film, can stay on the screen to move it.
2 dismantling CCFL lamp and LED lamp
In the rear lid is on two sets of CCFL lamp frame with 4 screws fixation and remove the screws to the lamp stand out, then the tubes and wires (both ends of a lamp tube has blackened aging) to remove, use double-sided adhesive will led light strip is affixed to the original lamp holder is arranged in the lamp tube position, pay attention to stick straight, lamp strip is too long be used oblique mouth clamp cut and carefully will screen according to the disassembly sequence assembly. This work must be bold but cautious, especially on the LCD panel and a logic circuit board connection should be more careful! Is the key to the success of the transformation. Once the broken or broken screen will be completely scrapped.
3 wire
Switch power supply to the high-voltage inverter board Sv, 12V power supply disconnect, the PT4115 component board (hereinafter referred to as the component board) CNO1 interface on the red line power board CN1 +12V. GND CN1, the black line connected to the foot end of the yellow line, then CN1 the foot switch signal (SLP). Component board CN02 socket and two LED lamp line plug well, the connection is completed.
The component plate is small, with double glue or screws fixed close to the switch position, with adhesive aluminum platinum tape put the lead on the metal frame to improve the anti-interference. Check all the connection without error can pass the electric test machine, generally can a success.
When the screen appears to check signal line, the instructions can work properly. Unplug the power line and the display shell, frame all installed, even the host display try machine for nearly four hours, image stabilization, colorful, normal function in the regulation and transformation to obtain the success.